The following was previously recommended in the README but currently I am not sure which ones are still valid. "It compiles for me" :-)
apt-get update
apt-get upgrade
apt-get install build-essential libasound2-dev libcurl4-openssl-dev libnotify-dev \
libxt-dev libiw-dev mesa-common-dev autoconf2.13 yasm libidl-dev \
libfreetype6-dev zlib1g-dev libgtk2.0-dev libdbus-glib-1-dev libpangox-1.0-dev
apt-get build-dep firefox-esr
Type make to build on my amd64 Buster release debian Linux
When compiled run objdir/dist/celtx/celtx if happy install with make install
This Makefile has clunky extra compile flags to make it find everything which are not necessary in my debian packaged version.. My debhelper rules is much simpler :
export DEB_BUILD_MAINT_OPTIONS = hardening=-fortify,-stackprotector,-format,-stackprotectorstrong
export DEB_CXXFLAGS_APPEND = -Wno-error=narrowing